EP2557379A1 - Elektrisches Expansionsventil - Google Patents

Elektrisches Expansionsventil Download PDF

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Publication number
EP2557379A1
EP2557379A1 EP12185816A EP12185816A EP2557379A1 EP 2557379 A1 EP2557379 A1 EP 2557379A1 EP 12185816 A EP12185816 A EP 12185816A EP 12185816 A EP12185816 A EP 12185816A EP 2557379 A1 EP2557379 A1 EP 2557379A1
Authority
EP
European Patent Office
Prior art keywords
valve
gear cup
valve body
expansion valve
electric expansion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12185816A
Other languages
English (en)
French (fr)
Inventor
Christian Parker
Craig Obermark
Gordon Coates
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Parker Hannifin Corp
Original Assignee
Parker Hannifin Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Parker Hannifin Corp filed Critical Parker Hannifin Corp
Publication of EP2557379A1 publication Critical patent/EP2557379A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates in general to an electronically controlled stepper motor valve used as an expansion valve on refrigeration, air conditioning and heat pump systems.
  • Expansion valves are used to control or meter the flow of refrigerant to an evaporator in an air conditioning system, to provide a refrigerant flow rate into the evaporator that approximately matches the refrigerant flow exiting the evaporator.
  • An expansion valve typically permits fluid flow from the inlet to the outlet during normal operation of the air conditioning system, where the fluid at the inlet is typically at a higher pressure than the fluid at the outlet.
  • EEVs Electronically operated step motor flow control valves are used for the precise control of liquid refrigerant flow as expansion valves referred to herein as EEVs.
  • an electronic controller sends signals to the step motor based on information provided to the controller by sensors. Synchronized signals to the motor provide discrete angular movement, which translates into precise linear positioning of the valve piston.
  • the EEV controls the flow of refrigerant entering the evaporator in response to signals sent by the controller.
  • a set of sensors either two temperature sensors or a pressure transducer and a temperature sensor, are used to measure superheat.
  • Typical control is based on superheat setpoint but an additional temperature sensor may be used to measure discharge water or air temperature. This air or water temperature is controlled directly, as long as superheat remains at a level to prevent floodback.
  • the ability of the EEV to control the amount of refrigerant in the evaporator to allow reaching discharge setpoint while preventing floodback makes the EEV the ideal expansion device for most air conditioning, chiller, environmental chamber, and refrigeration applications.
  • Some EEV controllers can be programmed to follow unique control algorithms making the EEV especially useful for many diverse applications.
  • an expansion valve comprising: a valve body defining an inlet and an outlet and a fluid passageway between them, the fluid passageway including a valve port; a stepper motor linear actuator including a stepper motor, gear cup, gear train, bearing, plunger guide, and lead screw; in which the gear cup is positioned in a cylindrical cavity in the valve body and threadably secured to the gear cup, the gear cup having an outside diameter which registers against the cylindrical cavity substantially 360 degrees; in which the gear cup includes a plurality of tabs extending axially away from the gear cup; a pin mating with the plunger and movable axially in and out of the valve port to open and close the valve.
  • an expansion valve comprising: a valve body defining an inlet and an outlet and a fluid passageway between them, the fluid passageway including a valve port; a stepper motor linear actuator including a stepper motor, gear cup, gear train, bearing, plunger guide, and lead screw; a pin mating with the plunger and movable axially in and out of the valve port to open and close the valve; and an electric feed through assembly providing electrical connection between the stepper motor and a mating cable connector; in which the electric feed through assembly includes for individual leads that are sequenced to allow the mating cable connector to be installed in any of four 90 degree positions.
  • the EEV 100 comprises a valve body 1 that houses a stepper motor linear actuator comprising a stepper motor 2, gear cup 3, gear train 4, bearing 5, plunger guide 6 and lead screw 7.
  • the gear cup 3 of the linear motor actuator is attached to the valve body 1 by a threaded connection.
  • the gear cup 3 also secures the plunger guide 6 within the valve body 1 when the gear cup 3 is threaded into the valve body 1.
  • Signals from an electronic controller travel through the feed through assembly 11 and rotate the stepper motor rotor in discrete angular movements. These angular movements are geared down and rotate the lead screw 7.
  • the lead screw 7 mates to the plunger 8.
  • the plunger guide 6 provides anti-rotation to the plunger 8.
  • the plunger 8 moves axially in the plunger guide 6 due to rotation of the lead screw 7.
  • the pin 9 mates to the plunger 8 and moves axially in and out of the valve port 10.
  • the gear cup 3 has an outside diameter substantially the same as the housing inside diameter.
  • the outside diameter of gear cup 3 contacts the housing 360 degrees about its circumference. This means the overall diameter of the valve body housing can be reduced to a minimum, saving material and increasing the maximum rated operating pressure potential due to the smaller valve body size.
  • the gear cup has a plurality of tabs 12 integrated in the die cast design which serve two purposes as best shown in FIG. 2 .
  • the tabs provide a key-in for the motor plate 15 (positioned between the gear cup 3 and the stepper motor 2) preventing rotation induced by the torque of the motor 2 and they allow the gear cup assembly to be tightened into the valve body 1 from the top.
  • the electrical feed through assembly 11 consists of a stainless steel part 11a with four small metal pins 11b glass fused into the centre as best shown in FIG. 4 .
  • the electrical feed through assembly 11 uses an o-ring seal 16 interface to the valve body 1 and is mechanically secured to the valve body using a process that rolls material over the top of the feed through assembly 11 as best shown at 17 in FIG. 3 .
  • This is a fast, efficient, and reliable method of sealing and eliminates the need for other typical sealing processes such as threading, brazing, welding or epoxy.
  • the electrical feed through assembly is designed to mate to a four pin plug and a polarized cable assembly. It is necessary to have some means to index the plug to the pins to assure alignment prior to pin engagement. Typically this alignment is in the form of a keyway brazed to the feed through assembly. This becomes problematic for the supplier performing the glass fusing process who must assure proper indexing of the four pins to the keyway.
  • the electrical feed through assembly 11 eliminates this problem with a design that is indexed after the four pins are glass fused to the assembly.
  • the electrical connection from the stepper motor 2 to the four pin feed through uses a flex board 18 or four wires and an integrated plug.
  • the specific order that the stepper motor leads are sequenced in a clockwise direction permits the mating cable connector, which also has specific sequencing, to be installed in any of the four 90 degree positions and still provide proper motor operation as best shown in FIGS. 6A-6D .
  • This benefits the operator assembling the valve since there is no need to index the four pin feed through assembly to the stepper motor electrical connector.
  • This also benefits the end user as they now have four position options when installing a 90 degree elbow style cable connector.
  • the ability to use a 90 degree elbow style cable connector allows the EEV footprint to be minimized which provides an advantage when the electric expansion valve is installed in the tight confines of a package system.
  • the motor housing design requires no welding, brazing, or epoxy/curing time to assemble.
  • the electrical feed through assembly is mechanically secured using a roll forming operation and is sealed with an o-ring. This improves manufacturing efficiency and requires no post cleaning operation.
  • This electric expansion valve is designed to accurately regulate flow in both directions. Normal flow direction is in the side connection and down through the port 10. Reverse flow direction is in the bottom connection and through the port 10, flowing against the pin 9. During reverse flow it is natural for the pin to be pulled towards the outlet flow path such that the pin nose will make contact with the seating surface of the valve port which can result in wear of the valve port seating surface.
  • the pin 9 is designed with two distinct surfaces; a frustoconical seating surface and the bullet shaped nose, or flow control surface (see FIG. 7 ). There is a taper or counter bore machined into the port 10. The top edge of this machined surface is the seating surface. This design eliminates the potential for the pin nose to make contact with the seating surface during reverse flow.
  • the present invention provides an electronic refrigerant flow control valve that provides precise flow control and high reliability in harsh environmental conditions (both external and internal exposure) while maintaining a low cost relative to design and manufacturability.
  • the precise control and reliability objective is obtained by a geared stepper motor turning a stainless steel ACME lead screw that drives a synthetic plunger attached to a valve pin or piston. This pin or piston moves in and out of the valve port to precisely regulate flow.
  • the valve offers flexible electrical connectivity options to ease installation and use.
  • the valve body contains the stepper motor linear actuator assembly which comprises of a stepper motor, gear train, gear cup, bearing, lead screw and plunger guide.
  • the mating arrangement design of the gear cup to the valve body assures concentricity of the plunger to the valve body port. This assures tight seating and precise flow control.
  • the mating arrangement eliminates a need for a second manufacturing operation to secure the plunger guide into the gear cup.
  • the threaded gear cup secures the plunger guide into the guide socket, as well as securing the bearing into the gear cup. This guide socket machined into the valve body is held in tight concentricity tolerance to the valve port.
  • the invention also provides an electric expansion valve comprising:
  • the pin includes a frustoconical seating surface and a bullet shaped flow control surface.
  • the valve does not include a welded or brazed connection.
  • the electrical connection having the four individual leads are formed as a flexible connector board.
  • the electrical feed through assembly is mechanically secured to the valve body by roll forming a portion of the valve body radially inward over a top portion of the feed through assembly.
  • the stepper motor linear actuator includes a stepper motor, gear cup, gear train, bearing, plunger guide, and lead screw.
  • the gear cup is positioned in a cylindrical cavity in the valve body and threadably secured to the gear cup, the gear cup having an outside diameter which registers against the cylindrical cavity of the valve body substantially 360 degrees.
  • the gear cup includes a plurality of tabs extending axially away from the bottom of the gear cup.
  • the plunger guide and the ball bearing is captured between gear cup and the valve body when the valve is assembled.
  • the electric expansion valve includes a motor plate having a plurality of slots about a circumference of the plate, in which the tabs on the gear cup engage the slots of the motor plate to provide a key-in for the motor plate to prevent rotation of the motor plate when the motor is engaged.
  • the invention also provides an electric expansion valve comprising:
  • the gear cup is positioned in a cylindrical cavity in the valve body and threadably secured to the gear cup, the gear cup having an outside diameter which registers against the cylindrical cavity of the valve body substantially 360 degrees.
  • the gear cup includes a plurality of tabs extending axially away from the bottom of the gear cup.
  • the plunger guide and the ball bearing is captured between gear cup and the valve body when the valve is assembled.
  • the pin includes a frustoconical seating surface and a bullet shaped flow control surface.
  • the valve does not include a welded or brazed connection.
  • the electric expansion valve includes a motor plate having a plurality of slots about a circumference of the plate, in which the tabs on the gear cup engage the slots of the motor plate to provide a key-in for the motor plate to prevent rotation of the motor plate when the motor is engaged.
  • the electrical connection having the four individual leads are formed as a flexible connector board.
  • the electrical feed through assembly is mechanically secured to the valve body by roll forming a portion of the valve body radially inward over a top portion of the feed through assembly.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
EP12185816A 2009-11-18 2010-11-17 Elektrisches Expansionsventil Withdrawn EP2557379A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26224009P 2009-11-18 2009-11-18
EP10787611A EP2502010A1 (de) 2009-11-18 2010-11-17 Elektrisches expansionsventil

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP10787611.2 Division 2010-11-17

Publications (1)

Publication Number Publication Date
EP2557379A1 true EP2557379A1 (de) 2013-02-13

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Family Applications (2)

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EP10787611A Withdrawn EP2502010A1 (de) 2009-11-18 2010-11-17 Elektrisches expansionsventil
EP12185816A Withdrawn EP2557379A1 (de) 2009-11-18 2010-11-17 Elektrisches Expansionsventil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10787611A Withdrawn EP2502010A1 (de) 2009-11-18 2010-11-17 Elektrisches expansionsventil

Country Status (3)

Country Link
US (1) US8960637B2 (de)
EP (2) EP2502010A1 (de)
WO (1) WO2011062944A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019206197A1 (de) * 2019-04-30 2020-11-05 Mahle International Gmbh Expansionsventil
US12072039B2 (en) 2018-12-20 2024-08-27 Danfoss A/S Electric expansion valve
US12117215B2 (en) 2018-12-20 2024-10-15 Danfoss A/S Valve having a motor arranged inside a tube having sections with different diameters

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102853598B (zh) * 2011-06-27 2015-04-15 浙江三花股份有限公司 一种电子膨胀阀
US9140613B2 (en) * 2012-03-16 2015-09-22 Zhejiang Dunan Hetian Metal Co., Ltd. Superheat sensor
US10030900B2 (en) 2012-08-01 2018-07-24 Parker-Hannifin Corporation Secondary fluid valve and system
DE102013200679A1 (de) 2013-01-17 2014-07-17 Honeywell Technologies Sarl Elektronisches expansionsorgan
CN104006164B (zh) * 2013-02-27 2017-06-30 浙江三花制冷集团有限公司 一种电子膨胀阀及其接插组件
CN104006204B (zh) * 2013-02-27 2018-06-01 浙江三花制冷集团有限公司 一种电子膨胀阀及其接插座
JP6142369B2 (ja) * 2013-02-27 2017-06-07 浙江三花制冷集団有限公司 電子膨張弁およびそれのための接続アセンブリ
JP2016089792A (ja) * 2014-11-10 2016-05-23 大豊工業株式会社 ウェイストゲートバルブ
US9803754B2 (en) 2014-12-04 2017-10-31 Resolution Air Ltd. Pinch valve systems and methods
GB2555587B (en) * 2016-10-31 2020-03-18 Utonomy Ltd Actuator for a regulator pilot valve
JP7447017B2 (ja) 2018-05-02 2024-03-11 ホートン， インコーポレイテッド エネルギーハーベスティングクラッチアセンブリおよびそれを搭載した車両、ならびにクラッチアセンブリを作動させる方法
WO2019240870A1 (en) * 2018-06-13 2019-12-19 Parker-Hannifin Corporation Refrigerant modulating valve for refrigeration, air-conditioning, and heat pump applications
CN113574348A (zh) * 2019-02-15 2021-10-29 富俊全球水暖集团有限责任公司 流体用量监控系统
CN114370511A (zh) * 2022-01-03 2022-04-19 浙江恒森实业集团有限公司 一种方便阀座更换的螺杆机膨胀阀

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US5364066A (en) * 1993-07-15 1994-11-15 Sporlan Valve Company Dual port valve with stepper motor actuator

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DE19909202C1 (de) 1999-03-03 2000-03-02 Honeywell Ag Expansionsventil
US6769666B2 (en) * 2001-11-15 2004-08-03 Fisher Controls International Llc Variable port valve plug
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JP4550528B2 (ja) * 2004-09-01 2010-09-22 株式会社不二工機 電動弁
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JP4749784B2 (ja) * 2005-07-19 2011-08-17 株式会社不二工機 電動弁
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Publication number Priority date Publication date Assignee Title
US5364066A (en) * 1993-07-15 1994-11-15 Sporlan Valve Company Dual port valve with stepper motor actuator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12072039B2 (en) 2018-12-20 2024-08-27 Danfoss A/S Electric expansion valve
US12117215B2 (en) 2018-12-20 2024-10-15 Danfoss A/S Valve having a motor arranged inside a tube having sections with different diameters
DE102019206197A1 (de) * 2019-04-30 2020-11-05 Mahle International Gmbh Expansionsventil

Also Published As

Publication number Publication date
US8960637B2 (en) 2015-02-24
US20120223262A1 (en) 2012-09-06
EP2502010A1 (de) 2012-09-26
WO2011062944A1 (en) 2011-05-26

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